Tambour-frame-operating mechanism.



J. J. KNEGHT.

TAMBOUR FRAME OPERATING MECHANISM! APPLICATION FILED JAN. 16, 1911.

1,079,863, Patented Nov. 25, 1913.

4 SHEETS-SHEET 1.

Flu.

M QM coLuMmA PLANOGRAPH c0., WASHINGTON. D. c.

J. J. KNEGHT TAMBOUR FRAME OPERATING MECHANISM.

' APPLICATION FILED JAN.16, 1911.

Patented Nov. 25,1913.

4 SHEETS-SHEET 2.

COLUMBIA PLANOGRAm-i c0.,WASmNu'roN, D. c I

J. J. KNEGHT.

TAMBOUR FRAME OPERATING MECHANISM.

APPLIQATION FILED JAN. 16, 1911.

1,079,863, Patented Nov.25,1913.

4 SHEETS-SHEET 3.

al I' COLUMBIA PLANOGRAPH 60.. WASHINGTON. D. c.

J. J. KNECHT TAMBOUR FRAME OPERATING MECHANISM. APPLICATION FILED JAN. 16, 1911.

1,079,863, Patented Nov. 25, 1913.

4 SHEETS-SHEET 4.

'uniTntn STATES PATENT OFFICE.

JOI-IAN'N JAKOB KNECHT, OF CHEMNITZ, GERMANY.

TAMBOUR-FRAME-OPERATING MECHANISM.

To all whom it may concern:

Be it known that I, J OI-IANN JAKOB KNnoH'r, a citizen of Switzerland, and residing at Chemnitz, Germany, have invented certain new and useful Improvements in Tambour-Frame-Operating Mechanism, of which the following is a specification.

My invention relates to means for driving embroidering-machines controlled by jacquard pattern-gear.

When embroidering-machines are controlled by pattern-gear the motion is transmitted to the embroidering-machine by crank-connection comprising a crank-guide or a star wheel. Such a crank-gearing is shown, for example, in my United States Letters Patent 1,005,436 of October 10, 1911. The motion which is transmitted by the crank-guide to the planet-wheel carrier is, however, non-uniform, it being slow at first, then somewhat accelerated, and fastest in the middle, whereupon toward the end of the motion the acceleration decreases. The mass of the embroidery frame is accelerated in the same manner, and not only may the acceleration sometimes attain a very high value but it is, generally speaking, disadvantageous for the motion of the embroidery frame. Now the motion of the embroidery frame could not hereto-fore be regulated to the desired extent without making constructional changes in the jacquard pattern-gear itself, but this was, however, connected with difliculties.

A primary object of my invention is to remedy these defects. To this end, I interpolate an auxiliary variable-connection either between the main shaft of the embroidering-machine and the jacquard pattern-gear, or between the jacquard patterngear and the motor-driven shaft, or in the jacquard pattern-gear itself, said auxiliary connection being adjusted to accelerate the motion of the embroidering-machine when the motion imparted to the machine by the jacquard patterngear through the medium of the crank-guide or of the star wheel is retarded, and to slow it down when the motion imparted to the embroidery frame is an accelerated motion.

Some illustrative embodiments of my invention are represented by way of example in the accompanying drawings, wherein Figures 1 to 6 show the first form, in which the auxiliary variable connection is inserted Specification of Letters Patent.

Application filed January 16, 1911.

Patented Nov. 25, 1913. Serial No. 602,946.

between the main shaft of the .embroideringmachine and the jacquard pattern-gear, Fig. 1 being a front elevation, partly in section, Figs. 2 and 3 sectional end elevations taken on the line AB in Fig. 1 showing the crank in two diiferent positions, Figs. 1 and 5 end and front elevations, respectively, of the jacquard pattern-gear, and Fig. 6 a front elevation, partly in section, enlarged, showing a shaft and planet gearing; Figs. 7 and 8 show another embodiment, in which the auxiliary variable connection is inserted between the motor-driven shaft and the jacquard pattern-gear, Fig. 7 being a front elevation and Fig. 8 a top plan view.

Referring firstly to Figs. 1 to 6, the numeral 1 designates the main shaft of the embroidering-machine carrying the spiral gear 2 meshing with the spiral gear 3 fast on the shaft 6 journaled in the floor frames 4 and 5. The disk 7 provided with a radial slot 8 is fast on the shaft 6. The floor frames 9 and 10 carry the shaft 11 carrying the sprocket wheel 12 which drives the jacquard pattern-gear by the chain 29. The shaft 11 also carries the crank-disk 13 provided with the crank-pin or guide block 1 1 movable in the slot 8. The two disks 7 and 13 are fixable on their shafts.

The shafts 17 and 26 (Fig. 41) are journaled in the two side walls 15, 16 of the jacquard pattern-gear. The sprocket wheel 21 is fast on the shaft 17 and the sprocket wheels 27, 28 are fast on the shaft 26. The sprocket wheel 27 is operatively connected by the chain 29 with the wheel 12 and the sprocket wheel 28 by the chain 20 with the wheel 21. The sprocket wheels are so designed that when the shaft 11 rotates once the shaft 17 rotates only about one-third of a revolution. Gears 80 are fast on the shaft 17. Two angle levers 81, 82 are mounted to rock on either side of each of these gears 80 and these levers carry on their pivots 83, 8 1 the spur gears 85, 86. Further, the axle 19 is secured by means of screws in the walls 15, 16 of the jacquard pattern-gear, and gears 87 are free to rotate on this axle. The gears 80, 85, 86 and 87 have pitch circles of equal diameter.

When the angle lever 81, 82 is rotated clockwise, the gear 85 is disconnected from and the gear 86 connected with the gear 87. As the gear 86 constantly rotates counterclockwise as shown by the arrow, the gear 87 has imparted to it a clockwise rotation. As soon as the angle lever 81, 82 is rotated counter-clockwise, however, the gear 86 is disconnected from and the gear 85 connected with the gear 87. As the gear 85 rotates clockwise as shown by its arrow, the gear 87 has now imparted to it a counter-clockwise rotation. Owing to the alternative rotation of the angle lever 81, 82 the motion of the main shaft 1 can thus be transmitted to the shaft 19 in such manner that the gear 87 is sometimes rotated in the one and sometimes in the other direction.

Further, firmly mounted in the side wall 16 of the acquard pattern-gear is the sleeve or hollow shaft 90 in which the screwthreaded spindle 18 is axially displaceable but not rotatable. The thread of this spindle engages in the thread of the rotatable but axially non-displaceable nut 91. Each wheel- 87 is rigidly connected with a crank 39 whose pin 40 engages in a slot 41 of a planet-wheel carrier 42 free to rotate on the sleeve 90. The pin 40 slides in the slot 41 by means of a guide block 43 under the action of the spring 44. The disks 7, 13 are so adjusted on their shafts that when the pin 40 traverses. the first half of its path in the slot 41 with an accelerated velocity the guide block'14 moves nearer the shaft 6, so that the angular velocity of the shaft 11 relatively to that of the shaft 6 decreases and, reversely, while the guide block 43 traverses the second part of its path with a retarded velocity in the guide 41, the guide block 14 moves away from the shaft 6, so that the angular velocity of the shaft 11 relatively to the shaft 6 increases. Consequently, the acceleration andretardation of the motion of thedriven parts of the jacquard patterngear are regulated, such regulation taking place not only at the beginning and end of a movement, but during the entire duration of the same.

The planet-wheel carriers 42 formed as disks are revolubly mounted on the sleeve 90. They form elements of a gearing (Fig. 6) for moving the embroidery frame, this gearing being like that described with reference to Fig. 3 of my above-mentioned patent. When several of the wheels 87 are rotated the individual displacements of the spindle 18 caused by the rotation of the wheels 87 are added together or subtracted one from another. Fast on the spindle 18 is the slide 48 which acts on the pin 49 of the embroidery frame. Now according as sometimes the wheel 86 and sometimes the wheel 85 meshes with the wheel87, the crank 39 is rotated either out of its position shown in full lines into the position shown in dotted lines, or out of its dotted position into that shown in full lines. If the auxiliary variable -connection 7, 13 were not employed the motion transmitted to the planet-wheel carrier 42 and consequently to the embroidery frame 50 would be slow at first, then somewhat accelerated, fastest in the middle, and slower again toward the end of the path, which disadvantage is obviated according to my invention.

In the illustrative embodiment according to Figs. 7 and 8 the numeral 22 designates the motor-driven shaft on which the two spiral gears 23, 24 are secured. The gear 24 imparts its rotatory motion to the main shaft 1 of the embroidering-machine through the medium of the spiral gear 25, and the gear 23 imparts its rotatory motion to the shaft 6 of the auxiliary variable-connection by means of the spiral gear 3. The auxiliary variable-commotion is arranged in the same 3 manner as in the illustrative embodiment according to Fig. 1, that is to say the guide disk 7 is fast on the shaft 6 and imparts its 3 motion to the disk 13 rigidly connected with the shaft 11, the guide block of the disk 13 being guided in the disk 7. The shaft 11 carries the sprocket wheel 12 which imparts its rotatory motion in the same manner as in the first illustrative embodiment to the jacquard pattern-gear actuating the embroidery frame.

I claim 1. In means for operating tambour frames controlled by jacquard pattern-gear, the combination with a acquard pattern-gear, a variable-cranleconnection for transmitting the motion of the jacquard pattern-gear to the frame of the embroidering-machine, of auxiliary variable-crank-connection moving with an accelerated and retarded rotary motion out of step with the former variablecrank-connection, and means for transmitting the motion of the auxiliary-variablecrank-connection to the former variablecrank-connection for the purpose of slowing the transmission of motion brought about by the former variable-crank-connection during its acceleration and accelerating the same during its retardation, whereby a unifrom speed is imparted to the frame of the embroidering-machine.

2. In means for operating tambour frames controlled by jacquard pattern-gear, the combination with a jacquard pattern-gear, a motor-driven shaft, and a variable-crankconnection for transmitting the motion of the jacquard pattern-gear to the frame of the embroidering-machine, of rotating auxiliary variablecrank-connection driven by said shaft and moving non-synchronously with the former connection and means for transmitting the motion of the auxiliary variable-crank-connection to the former variable-crank-connection, for the purpose of slowing the transmission of motion brought about by the former connection during its acceleration and accelerating the same during its retardation, whereby a uniform speed is imparted to the frame of the embroidering-machine.

3. In means for operating tambour frames controlled by jacquard pattern-gear, the combination with a jacquard pattern-gear, a motor, the main shaft of the embroidering-machine driven thereby, and a variablecrank-connection for transmitting the motion of the jacquard pattern-gear to the frame of the embroidering-machine, of auxiliary-crank-connection driven by said shaft, the speed of the auxiliary connection being a minimum when the speed of the former connection is a maximum, and means for transmitting the motion of the auxiliary variable-crank-connection to the former variablecrank-connection for the purpose of slowing the transmission of motion brought about by the former connection during its acceleration and accelerating the same during its retardation, whereby a uniform speed is imparted to the frame of the embroidering-machine.

4. In means for operating tambour frames, controlled by jacquard pattern gear, the combination with a jacquard pattern-gear, a frame, means comprising variable-crankconnection adapted to give an alternately accelerated and retarded motion to said frame, and a driving shaft; of means driven by said shaft for driving said variablecrank-connection with an alternately retarded and accelerated motion, synchronizing with the former accelerated and retarded motion respectively, thereby imparting a uniform motion to said frame In testimony whereof, I affix my signature in the presence of two Witnesses.

J OHANN J AKOB KN ECHT.

Witnesses:

WM. WASHINGTON BRUNSWICK, MAX J. BENNDORF.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

